WO2004052693A1 - エアバッグ用ガス発生器 - Google Patents
エアバッグ用ガス発生器 Download PDFInfo
- Publication number
- WO2004052693A1 WO2004052693A1 PCT/JP2003/015725 JP0315725W WO2004052693A1 WO 2004052693 A1 WO2004052693 A1 WO 2004052693A1 JP 0315725 W JP0315725 W JP 0315725W WO 2004052693 A1 WO2004052693 A1 WO 2004052693A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- housing
- shielding plate
- gas
- edge
- contact
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
- B60R21/2644—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R2021/26011—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using a filter through which the inflation gas passes
Definitions
- the present invention relates to a gas generator for an airbag that protects an occupant from an impact.
- the gas generator is equipped with a coolant filter for cooling the high-temperature combustion gas generated by the combustion of the gas generating agent and collecting combustion residues. From the viewpoint of weight reduction, it is required to reduce the weight of the coolant * filter without lowering the cooling effect and the like.
- gas generating agents used in gas generators do not always have high ignitability depending on the composition. Even with such a gas generating agent, it is necessary that ignition can be started and completed within a predetermined time and gas can be introduced into the airbag so as to restrain the occupant in the event of a collision.
- the present invention provides a gas generator for an airbag, which has a structure in which the cooling effect of a cooler filter is improved while achieving a reduction in size and weight, and the ignitability of a gas generating agent is improved.
- the task is to provide
- the invention according to claim 1 includes, as a means for solving the problems, a housing having a gas discharge port, an ignition means chamber containing an ignition means operated by impact, and a gas generating agent for generating combustion gas by igniting and burning.
- a gas generator for an air bag having a combustion chamber accommodated therein, a tubular filter disposed between the combustion chamber and the gas outlet, and a combustion gas passing through the filter and being discharged from the gas outlet.
- An inner cylindrical shielding plate is arranged inside the cylindrical filter
- the inner cylindrical shielding plate is arranged such that a lower end opening peripheral edge is in contact with a housing bottom surface, and an upper end opening peripheral edge is spaced from a housing ceiling surface.
- a gas generator for an airbag wherein a portion having good air permeability is provided between the gas generators.
- the inner cylindrical shielding plate is required to have heat resistance, it is formed of a metal such as stainless steel.
- the ignition means When the ignition means is activated, its ignition energy (flame, high-temperature combustion gas, etc.) is released into the combustion chamber, and the gas generating agent is ignited and burned. At this time, since the ignition energy intensively collides with the cylindrical filter (coolant filter) existing in the direction of the progress of the ignition energy, the damage to that part may be large. Furthermore, since the combustion gas generated by the combustion of the gas generating agent passes through the cylindrical filter in the width direction, the cooling and filtration (filtration of the combustion residue) time is only the passage time in the width direction.
- the ignition energy will impinge on the inner cylindrical shielding plate.
- the ignition energy is prevented from colliding intensively with only a part of the cylindrical filter.
- the following effects are simultaneously performed for the inner cylindrical shielding plate. That is, when the inner cylindrical shielding member does not exist and the gas generating agent is present in a large amount in a direction other than the direction in which the ignition energy is emitted toward the combustion chamber, the gas generating agent existing in that direction is ignited. It becomes difficult. Therefore, if the inner cylindrical shielding plate is arranged and the ignition energy collides with the inner cylindrical shielding plate, the direction of progress of the ignition energy changes, so that the entire amount of the gas generating agent filled in the combustion chamber is ignited and burned. Performance will be improved. This structure is preferable especially when the ignitability of the gas generating agent is low.
- a housing having a gas discharge port, an ignition means chamber containing ignition means operated by impact, and a gas generating agent which generates combustion gas by igniting and burning are provided.
- An airbag gas generator having a combustion chamber accommodated therein, a cylindrical filter disposed between the combustion chamber and the gas outlet, and a combustion gas passing through the filter and being discharged from the gas outlet; Yes,
- an inner cylindrical shielding plate and an outer cylindrical shielding plate are arranged, respectively.
- the inner cylindrical shielding plate is arranged so that the lower peripheral edge of the opening is in contact with the housing bottom surface and the upper peripheral edge of the opening is spaced from the housing ceiling surface. There is a part with good ventilation between
- the outer cylindrical shielding plate has an upper end opening edge which is in contact with the housing ceiling surface, a lower end opening edge which is arranged with a gap between the housing bottom surface, and a gap between the outer cylindrical shielding plate and the eight housing peripheral wall having a gas discharge port.
- Airbag gas generator Providing livestock.
- the function performed by the invention of claim 1 is further enhanced.
- the arrangement of the inner cylindrical shielding plate and the outer cylindrical shielding plate allows the combustion gas to flow semi-forcedly in the axial direction of the cylindrical filter, thereby increasing the contact time between the combustion gas and the cylindrical filter.
- the combustion gas can flow in the entire axial and width regions of the cylindrical filter, the cooling and filtering effects are improved. Therefore, the thickness and the like of the cylindrical filter can be reduced, and the mass of the cylindrical filter can be reduced.
- the invention according to claim 3 is the gas generator for an airbag according to claim 1 or 2, wherein the inner cylindrical shielding plate is arranged such that a lower end opening peripheral edge is in contact with the housing bottom surface and an upper end opening peripheral edge is in contact with the housing ceiling surface. And a vent having a vent hole on the peripheral edge side of the upper end opening, and further provided with a portion having good air permeability between the inner peripheral surface of the tubular filler and the inner tubular shielding plate.
- an interval is provided between the peripheral edge of the upper end opening of the inner cylindrical shielding plate and the housing ceiling surface, and the combustion gas moves to the cylindrical fill side through the interval.
- the entire inner peripheral surface of the cylindrical filter is covered by the inner cylindrical shielding plate, and a ventilation hole is provided at a portion corresponding to the interval in the invention of claim 1. Things.
- the invention according to claim 4 is the gas generator for an airbag according to claim 2 or 3, wherein the outer cylindrical shielding plate is arranged such that an upper end opening peripheral edge is in contact with the housing ceiling surface and a lower end opening peripheral edge is in contact with the eight housing bottom surface. And a vent having a vent hole on the peripheral edge side of the lower end opening, and being disposed so as to form a gap between the gas outlet and the housing peripheral wall.
- an interval is provided between the peripheral edge of the lower end opening of the outer cylindrical shielding plate and the bottom surface of the housing, and the combustion gas reaches the gas outlet through the interval.
- the outer periphery of the tubular filter is provided by the outer tubular shielding plate.
- a ventilation hole is provided in a portion corresponding to the interval in the invention of claim 2 so as to cover the entire surface.
- the invention according to claim 5 includes a housing having a gas discharge port, an ignition means chamber containing ignition means which is operated by impact, and a combustion chamber containing a gas generating agent which generates combustion gas by igniting and burning.
- a gas filter for an airbag wherein a cylindrical filter is disposed between the combustion chamber and the gas discharge port, and the combustion gas passes through the filter and is discharged from the gas discharge port;
- the internal space of the inner cylinder arranged in the center of the housing forms an ignition means chamber, and the ignition means chamber and the combustion chamber are communicated by a communication hole formed in the peripheral wall of the inner cylinder.
- An inner cylindrical shielding plate is arranged, and the inner cylindrical shielding plate has an upper end opening peripheral edge in contact with a housing ceiling surface so that combustion gas can pass between the lower end opening peripheral edge and the housing bottom surface, or The peripheral edge of the lower opening is in contact with the bottom surface of the housing, so that the combustion gas can pass between the peripheral edge of the upper end and the housing ceiling, and the ventilation between the inner peripheral surface of the cylindrical filter and the inner cylindrical shielding plate. Good parts are provided,
- a gas generator for an airbag wherein a communication hole provided in a peripheral wall of an inner cylinder is provided at a position facing an inner cylindrical shielding plate.
- a communication hole is formed as a passage through which ignition energy (hot gas, flame, etc.) is discharged toward the combustion chamber.
- ignition energy hot gas, flame, etc.
- the part where the ignition energy collides with the cylindrical fill differs depending on the position.
- the communication hole exists in a part of the inner cylinder, the amount of ignition energy that collides with the cylindrical filter increases.
- the diameter of the communication hole is small or the number is small, the flow speed of the ignition energy discharged from the communication hole increases, so that the ignition energy collides with a part of the cylindrical fill.
- the inner cylindrical shielding plate extends downward or upward from the housing ceiling surface side or from the housing bottom surface side, and faces the communication hole.
- the ignition energy released from the communication hole into the combustion chamber always collides with the inner cylindrical shielding plate. Therefore, regardless of the position of the communication hole, the size of the hole, the number of holes, and the like, the ignition energy is prevented from colliding with a part of the cylindrical filter, and the filter may be damaged. Absent. Further, in the same manner as in the first aspect of the present invention, the effect of improving the cooling and filtering effects by the cylindrical filler and the effect of improving the ignitability of the gas generating agent in the combustion chamber are exhibited. This structure is particularly suitable for burning a gas generating agent having low ignitability.
- the invention according to claim 6 is the gas generator for an airbag according to claim 5, wherein the inner cylindrical shielding plate has an upper end opening peripheral edge in contact with the housing ceiling surface, and a lower end opening peripheral edge is spaced from the housing bottom surface.
- the inner cylindrical shielding plate has an upper end opening peripheral edge in contact with the housing ceiling surface, and a lower end opening peripheral edge is spaced from the housing bottom surface.
- the relationship between the formation position of the communication hole formed in the peripheral wall of the inner cylinder in the eight housing axis direction and the position of the tip of the inner cylindrical shielding plate or the formation position of the ventilation hole is determined from the housing ceiling surface to the bottom surface. If the height is L,
- the communication hole is formed in the inner cylinder peripheral wall within a range of 0.05 L to 0.6 L from the housing ceiling surface.
- the position of the tip of the inner cylindrical shielding plate or the formation position of the ventilation hole is in the range of 0.3 L to 0.8 L from the housing ceiling surface
- the communication hole and the inner cylindrical shielding plate are provided so as to face each other.
- the position of the communication hole is based on the center of the communication hole. Since the communication hole is a hole having a small diameter (for example, l to 4 mm), the effect of the present invention is not impaired even with reference to the center of the hole. When a plurality of communication holes are provided side by side in the axial direction, the communication hole closest to the housing bottom surface is used as a reference.
- the formation position of the ventilation hole is such that the communication hole and the ventilation hole do not face each other with reference to the lower end portion of the ventilation hole (the communication hole faces the portion of the plate without the ventilation hole).
- the present invention is a means for more reliably exhibiting the operation and effect of the invention of claim 5 described above, and includes a position where a communication hole is formed and a position of a tip end portion of an inner cylindrical shielding plate (when there is a ventilation hole). Indicates the adjustment range with the position of the ventilation hole.
- the respective positional relations can be appropriately adjusted so as to fall within the above-described ranges, and such that the communication holes and the inner cylindrical shielding plate face each other.
- the formation position of the communication hole is 0.05 L
- the position of the tip of the shielding plate is 0.3 L
- the position of the tip of the shielding plate is 0.3 L. 0.8 L.
- the invention according to claim 7 is the gas generator for an airbag according to claim 5, wherein the inner cylindrical shielding plate has a lower end opening peripheral edge in contact with the housing bottom surface, and an upper end opening peripheral edge located between the housing and the ceiling ceiling surface. When they are arranged so that there is a gap, or when the lower opening edge is in contact with the housing bottom surface, the upper edge opening edge is in contact with the housing ceiling surface, and a plurality of ventilation holes are provided on the upper edge opening edge,
- the communication hole is formed in the inner cylinder peripheral wall in a range of 0.05 L to 0.6 L from the bottom of the housing,
- the position of the tip of the inner cylindrical shielding plate or the formation position of the ventilation hole is in the range of 0.3 L to 0.8 L from the housing bottom,
- the communication hole and the inner cylindrical shielding plate are provided so as to face each other.
- the position of the communication hole is based on the center of the communication hole. Since the communication hole is a hole having a small diameter (for example, l to 4 nim), the effect of the present invention is not impaired even with reference to the center. When a plurality of communication holes are provided side by side in the axial direction, the communication hole closest to the housing ceiling surface is used as a reference.
- the formation position of the ventilation hole is based on the upper end of the ventilation hole. (The communication hole is directly opposite to the part of the plate with no ventilation hole).
- the invention according to claim 8 is the gas generator for an airbag according to any one of claims 1 to 7, wherein the inner cylindrical shielding plate comprises: an annular bottom surface; and an annular peripheral wall suspended from the annular bottom surface.
- the diameter of the annular bottom is set to be larger than the diameter of the annular peripheral wall,
- the width of the annular bottom (difference between the outer and inner diameters of the annular bottom) and the difference between the inner diameter of the cylindrical filter and the outer diameter of the inner cylinder can be made almost equal.
- the inner peripheral edge of the annular bottom surface contacts the outer peripheral wall of the inner cylinder, and the outer peripheral edge contacts the inner peripheral surface of the cylindrical filler.
- an inner cylindrical shielding plate composed of an annular bottom surface and an annular peripheral wall, positioning between the inner cylinder and the cylindrical filter is facilitated, and the inner cylindrical shielding plate and the cylindrical filter can be connected to each other. Since an interval is provided between them, a portion having good air permeability can be easily formed.
- the invention according to claim 9 is the gas generator for an airbag according to any one of claims 5 to 8, further comprising an outer cylindrical shielding plate force S arranged outside the cylindrical filter.
- One end of the plate is in contact with the housing ceiling surface or the housing bottom surface, and the other end opening periphery is arranged with a space between the housing bottom surface or the housing ceiling surface, and further between the housing peripheral wall having a gas discharge port. That are arranged such that a gap is created in the space.
- the same operation as the invention of claim 2 is performed, and the outer cylindrical shielding plate is used in combination with the inner cylindrical shielding plate, and the inner cylindrical shielding plate is provided below the housing ceiling surface.
- the outer tubular shield is And extend it upward. If the mounting method of the inner cylindrical shielding plate is reversed, the outer cylindrical shielding plate is also mounted in reverse.
- the invention according to claim 10 is the gas generator for an airbag according to any one of claims 5 to 8, further comprising an outer cylindrical shielding plate provided outside the cylindrical filler.
- the plate is provided with a gas vent on the other end opening peripheral side, the one end opening edge being in contact with the eight housing ceiling surface or the housing bottom surface, and the other end opening peripheral edge being in contact with the housing bottom surface or the ceiling surface.
- An object is provided in which a gap is formed between the housing and a peripheral wall having an outlet.
- the present invention differs from the eighth aspect only in the structure of the outer cylindrical shielding plate, and has the same effect as the second aspect.
- the invention of claim 11 is the gas generator for an airbag according to any one of claims 1 to 10, wherein the air permeability provided between the inner peripheral surface of the cylindrical filter and the inner cylindrical shielding plate.
- a good part is a force that is a cylindrical space provided between the inner peripheral surface of the cylindrical filter and the inner cylindrical shielding plate, or a sparse structure of the cylindrical filter.
- the invention according to claim 12 is the gas generator for an airbag according to any one of claims 1 to 11, wherein the bulk density of the tubular fill is 1 to 5 g Z cm 3 and the thickness is 3 Provide what is 110 mm.
- the invention according to claim 13 is the gas generator for an airbag according to any one of claims 1 to 12, which has good air permeability provided between the surface of the cylindrical filter and the inner cylindrical shielding plate. Provide the part width is 0.5-3mm.
- the invention of claim 14 is the gas generator for an air bag according to any one of claims 1 to 13, wherein the ignition means is an electric igniter operated by an ignition current and an electric igniter operated by the electric igniter. It consists of an explosive to be ignited, and a gas generating agent with a combustion temperature of 1700 to 3000 ° C is used
- the gas generator for airbag inflation provided in the combustion chamber is provided with a gas generator with a combustion temperature of 1000 to 1700 ° C.
- ZPP zirconium and potassium perchlorate; 90 g to 300 g of ZPP
- Examples of the gas generating agent having a combustion temperature of 1700 to 3000 include those having a composition using nitroguanidine as a fuel and strontium nitrate as an oxidizing agent. This gas generating agent has good ignitability, and can be directly bonded and fired by an igniter containing the above amount of ZPP.
- the combustion of the gas generating agent 1 is completed by changing the shape of the gas generating agent 1 into a single-hole / porous cylindrical shape having a through hole, a single hole or a cylindrical shape having no hole, or a cylindrical pellet shape. Time can be adjusted.
- Combustion temperature 1000 1700 as the gas generating agent D C, for example, nitric acid guanidine as a fuel, the gas generating agent having a composition of basic copper oxide and an oxidizing agent (the gas generating agent 2) can be exemplified. Since the gas generating agent 2 is inferior in ignitability to the gas generating agent 1, it is difficult to directly ignite 'combustion using only the igniter as described above, but since the combustion temperature is low, the load on the coolant is low. small. Therefore, the coolant can be simplified and the size of the entire gas generator can be reduced. The low ignitability of the gas generating agent 2 can be solved by combining the gas generating agent 1 with a combustion temperature of 1700 to 3000 ° C.
- boron nitrite has been known as an explosive, but since boron nitrite is in powder form and completes combustion instantaneously, it ignites a gas generator with low ignitability such as gas generator 2. Not appropriate to let. Therefore, by adjusting the shape and the like, by using the gas generating agent 1 that can maintain the combustion sustainability to a certain extent as a transfer agent, the ignition performance of the gas generating agent 2 can be improved. Furthermore, since the transfer charge is also a gas generating agent, the gas generated by the combustion of the transfer charge can also be used as the gas for deploying the airbag.
- FIG. 1 is a cross-sectional view in the axial direction of a gas generator for an airbag.
- FIG. 2 is a schematic plan view for explaining an arrangement state of the second transfer charge in FIG.
- FIG. 3 is a schematic sectional view of another embodiment of FIG.
- FIG. 4 is a conceptual diagram for explaining the outflow state of the combustion gas.
- FIG. 5 is an axial cross-sectional view of an airbag gas generator according to another embodiment.
- FIG. 6 is a diagram for explaining the positional relationship between the communication hole and the inner cylindrical shielding plate in FIG.
- FIG. 1 is a cross-sectional view in the axial direction of the airbag gas generator of the present invention.
- axial direction means the axial direction of the housing
- radial direction means the radial direction of the housing.
- an outer shell container is formed by a housing 11 formed by joining a diffuser shell 12 and a closure shell 13 forming an internal storage space together with the diffuser shell 12.
- the diffuser shell 12 and the closure shell 13 are welded at a welded portion 14.
- the other black portions also indicate welds.
- the diffuser shell 12 is provided with a required number of gas outlets 17 and 18.
- the gas outlets 17 and 18 may have the same diameter or different diameters.
- a substantially cylindrical inner cylinder 15 is disposed in the housing 11, and an upper end periphery of the inner cylinder 15 is joined to a ceiling surface 12 a of the diffuser 12, and a lower end periphery is a closure shell 13 The inner and outer spaces are separated by being joined to the bottom surface 13a of the.
- the inner cylinder 15 is radially enlarged at the inclined wall portion 15a such that the inner diameter of the upper portion (the ceiling surface 12a side) is larger than the inner diameter of the lower portion (the bottom surface 13a side). .
- the volume of the internal space particularly the first combustion chamber 20 and the second combustion chamber, can be maintained while the height of the gas generator 10 is kept low. It is preferable because the volume ratio of the chamber 25 (for example, in the range of 4/6 to 9/1, preferably 1 to 1/8/2) can be adjusted.
- An annular (or cylindrical) first combustion chamber 20 is provided in the outer space of the inner cylinder 15 and contains a first gas generating agent (not shown).
- a first gas generating agent those having a combustion temperature of 1000 to 1700 ° C can be used.
- a second combustion chamber 25 containing a second gas generating agent (not shown) is provided above the inner cylinder 15, and an ignition means chamber containing two ignition means is provided below the inner cylinder 15. Is set Have been killed.
- the second gas generating agent those having a combustion temperature of 1000 to 1700 ° C can be used.
- An electric first igniter 31 and a first transfer charge 35 are arranged in the first ignition means chamber, and an electric second igniter 32 and a second transfer charge are disposed in the second ignition means chamber. 36 are arranged.
- the first igniter 31 and the second igniter 32 are fixed to one collar 33 and mounted in parallel in the radial direction.
- the first igniter 31 and the second igniter 32 are connected to a power source (battery) via a connector and a lead wire.
- a gas generating agent having a combustion temperature of 1700 to 3000 ° C can be used as the first transfer agent 35 and the second transfer agent 36.
- the inner diameter of the skirt portion 41 is set to be substantially the same as the diameter of the ignition portion of the igniter 32, and the skirt portion 41 is in close contact with and surrounds the ignition portion. The flame generated by the operation goes straight only in the second through-hole 52 direction.
- the second combustion chamber 25 is separated from the two igniters, and the space between the first igniter 31 and the second igniter 32 is formed. Because of the separation, the ignition energy (flame, combustion gas, etc.) generated by the operation of the first igniter 31 enters the second ignition means chamber and further passes through the second through hole 52 to the second combustion chamber. It is prevented from entering into 25.
- a first transfer charge 35 filled in an aluminum cup is arranged.
- a first through hole 51 provided at a lower portion of the side wall of the inner cylinder 15 communicates the first combustion chamber 20 with the first ignition means chamber, and is substantially in communication with the center of the first transfer agent 35. The direction of the flame generated by the operation of the first igniter 31 is not directly opposed to the first through hole 51.
- a seal tape 60 made of aluminum or stainless steel is attached to the first through hole 51 from inside.
- the operation of the first igniter 31 makes the entire first charge 35 substantially uniform. Burned.
- the ignition energy generated by the combustion of the first transfer agent 35 is turned upward after being discharged in the radial direction. As a result, the ignitability of the entire first gas generating agent contained in the first combustion chamber 20 is improved.
- FIG. 2 is a plan view showing an arrangement state of the second transfer charge 36.
- a second transfer charge 36 is arranged above the second igniter 32 and on the flat partition wall 40.
- the second transfer charge 36 is filled in an aluminum cup 45 having a plurality of transfer holes 46.
- the plurality of heat transfer holes 46 are not directly opposed to the traveling direction of the flame generated by the operation of the second igniter 32 (directly above the second igniter 32).
- the aluminum power pack 45 filled with the second transfer charge 36 has a shape having a convex portion 47 directly above the second igniter 32. be able to.
- a convex portion 47 By providing such a convex portion 47, the filling amount of the second transfer agent 36 can be increased, so that the ignitability of the second gas generating agent is further improved.
- a heat transfer hole 46 is provided on a plane excluding the convex portion 47.
- a cylindrical bottomed retainer 55 is fitted into the second combustion chamber 25 with the opening side down, and the inner wall 25 a of the second combustion chamber 25 is formed at the side wall tip 55 a. It is fixed by pressing.
- a gap 57 is provided between the side wall of the retainer 55 and the inner wall 25a of the second combustion chamber 25 to such an extent that a gas flow path can be secured.
- the retainer 55 has a plurality of openings (nozzles) 56 in the side wall, and the height of these openings 56 in the axial direction is the third position provided in the inner cylinder 15.
- the height is set to be higher than the height position of the through hole 53.
- the third through-hole 53 is closed from the outside by a seal tape 58 made of stainless steel, and the opening 56 may be closed from the inside by a seal tape 80 made of aluminum or stainless steel.
- the opening 56 is closed with the sealing tape 80, the second combustion chamber 20 and the second combustion chamber 25 start combustion at the same time due to the simultaneous operation of the two igniters. Since the internal pressure of the chamber 25 is temporarily increased, the ignitability of the second gas generating agent is improved.
- the third through hole 53 is closed by the second gas generating agent. Is prevented. If the third through-hole 53 is closed by the second gas generating agent, the internal pressure in the second combustion chamber 25 excessively increases in the early stage of combustion, and the second gas that blocks the third through-hole 53 When the generator burns, opening the third through-hole 53 sharply lowers the internal pressure, which may impair stable combustibility.
- the third through hole 53 is provided below the second combustion chamber 25.
- the fire around the entire inside of the combustion chamber 25 is improved, and the combustibility of the second gas generating agent is improved.
- the total opening area of the third through holes 53 is set to be smaller than the total opening area of the openings 56 and smaller than the total opening area of the gas discharge ports 17 and 18.
- the first igniter 31 operates first and the second igniter 32 operates with a delay, that is, the first gas generating agent in the first combustion chamber 20 burns first, and the second combustion chamber
- the pressure in second combustion chamber 25 becomes sufficiently higher than the pressure in first combustion chamber 20. Therefore, by setting the total opening area of the third through holes 53 as described above, the outflow speed of the combustion gas from the second combustion chamber 25 is controlled by the third through holes 53. Therefore, the internal pressure during combustion in the second combustion chamber 25 is also controlled by the third through hole 53. Therefore, the combustion state in the second combustion chamber 25 is controlled by the third through hole 53.
- the first igniter 31 and the second igniter 32 operate simultaneously, the pressure difference between the first combustion chamber 20 and the second combustion chamber 25 becomes small, so that the second combustion chamber 25 Although the internal pressure becomes higher, the influence of the pressure control by the third through hole 53 becomes smaller.
- the second igniter 32 may be operated to ignite and burn the second gas generating agent about 100 ms after the operation of the first igniter 31.
- the combustion state of the second combustion chamber 25 can be controlled by the third through-hole 53, the ignitability of the second gas generating agent is improved and the generation of NOX and the like is suppressed. preferable.
- removing the combustion residues from the combustion gas is the same. Further, a cylindrical filter 65 for cooling the combustion gas is disposed.
- the cylindrical filter 65 is obtained by winding a thin metal wire (iron wire or the like) having a wire diameter of about 0.3 to 1.2 mm in a cylindrical shape; Use a plain weave, tatami weave, or twill tatami wire mesh with a wire diameter of about 0.3 to 0.8 mm, singly or in combination, or use a ceramic fiber or metal fiber sandwiched between these wire meshes. be able to.
- a thin metal wire iron wire or the like
- the structure of the cylindrical filter is appropriately selected according to the type of gas generating agent to be used (high or low combustion temperature, slight amount of generated combustion residue).
- the bulk density is 1 to 5 gZcm 3 , preferably 2 to 3 g / cm 3
- the thickness is 3 to 10 mm, preferably 3 to 6 mm can be used.
- An inner cylindrical shielding plate 66 is arranged inside the cylindrical filter 65, and a gap (first gap 71) is provided between the cylindrical filter 65 and the inner cylindrical shielding plate 66. It should be noted that, instead of the gap, the inner cylindrical shielding plate 66 at the portion in contact with the tubular filler 65 (a portion having the same width as the gap) is made to have a sparse structure, so that a gap is practically provided. A similar state may be used.
- the sparse structure is for the remaining dense structure. When the bulk density of the dense structure is within the above range, the bulk density of the sparse structure can be 0.1 to 1.0 g / cm 3 .
- the width of the gap and the sparse structure portion is preferably 0.5 to 3 mm, more preferably 1 to 2 mm.
- an outer cylindrical shielding plate 67 is disposed in contact with the outer peripheral surface of the cylindrical filter 65.
- a gap (second gap 72) is provided between the outer cylindrical shielding plate 67 and the peripheral wall of the housing 11. It is preferable that the second gap 72 is set wider than the width of the first gap 71.
- the inner cylindrical shielding plate 66 and the outer cylindrical shielding plate 67 do not cover the entire surface of the cylindrical filter 65.
- the inner cylindrical shielding plate 66 has the lower end of the cylindrical filter 65 (1/2 to 2/2 with respect to the total height of the cylindrical filter 65), with one peripheral edge of the inner cylindrical shielding plate 66 being in contact with the bottom surface 13a. Height range of about 3).
- the inner cylindrical shielding plate 66 by covering the entire inner peripheral surface of the filter 65 with the inner cylindrical shielding plate 66 and providing a plurality of ventilation holes in part, it is possible to achieve a state similar to that shown in FIG. good.
- the same state as that shown in FIG. 1 may be obtained. .
- seal tape 75 blocking the gas outlets 17 and 18 may burst at the same time depending on the operating conditions of the igniter (one-sided operation, two-sided operation, and operation with a time difference). It can be set to burst only partially.
- the transfer charge 3 5 force S is ignited and burned, and the ignition energy breaks the seal tape 60, passes through the first through hole 51, and is discharged into the first combustion chamber 20. It is. At this time, after the ignition energy is released in the radial direction, the ignition energy moves upward in the first combustion chamber 20, so that the ignition combustibility of the first gas generating agent is good. Since the third through-hole 53 is closed by the stainless steel sealing tape 58, the combustion gas in the first combustion chamber 20 does not flow into the second combustion chamber 25.
- the combustion gas generated in the first combustion chamber 20 (and the ignition energy generated by the first ignition means) and the combustion gas generated in the second combustion chamber 25 are indicated by arrows in FIG. It moves by such a flow.
- the direction is changed, and the gas generating agent existing in the subsequent traveling direction is ignited and burned.
- the traveling direction of the ignition energy is changed from the radial direction to the axial direction by the inner cylindrical shielding plate 66, and the ignition energy is supplied to the gas generating agent existing in both the radial direction and the axial direction. Therefore, the ignitable combustion of the entire first gas generating agent present in the first combustion chamber 20 is improved.
- the ignition energy released radially outward from the first through-hole 51 is sufficiently given to the first gas generating agent existing in the release direction.
- such a problem becomes conspicuous when a gas generating agent having low ignitability is used.
- the use of the inner cylindrical shielding plate 66 does not cause the above problem.
- the inner cylindrical shielding plate 66 it is possible to prevent the ignition energy from colliding with a part of the cylindrical filter 65 and prevent the cylindrical filter 65 from being damaged.
- the position of the first through hole 51 in the axial direction is adjusted so that such an action is performed.
- the combustion gas generated in the first combustion chamber 20 and the second combustion chamber 25 enters the portion (or vent) not covered by the inner cylindrical shielding plate 66, and enters the cylindrical filter 65, A part moves in the axial direction in the cylindrical filter 65 as it is, and then reaches the second gap 72.
- the remainder of the combustion gas moves through the first gap 71, and then passes through the cylindrical filter 65 in the radial direction to reach the second gap 72.
- the combustion gas ruptures part or all of the seal tape 75 and is discharged from part or all of the gas discharge ports 17 and 18 to inflate the airbag.
- the second igniter 32 is activated. At this time, the flame travels straight through the second through-hole 52, but since the direction of travel of the flame is not directly opposite to the transmission hole 46, the second transmission filled in the aluminum cup 45 is performed. After all of the explosives 36 have been ignited and burned, the ignition energy is released from the transfer holes 46 into the second combustion chamber 25.
- the second gas generating agent in the second combustion chamber 25 is ignited and burned by the intrusion of ignition energy, but as described above, the height of the opening 56 of the retainer 55 and the height of the third through hole 53 are as described above. Since the position is adjusted, the fire around the entire second combustion chamber 25 is good, and the ignition and combustibility of the second gas generating agent is good. When the opening 56 is closed with the seal tape 80, the initial combustibility of the second gas generating agent is improved.
- the gas generated in the second combustion chamber 25 is radially released from the third through hole 53, flows into the first combustion chamber 20, and then passes through the cylindrical filter 65 in the same manner as described above. After being cooled and filtered, it is discharged from gas outlets 17 and 18 to further inflate the airbag.
- FIG. 5 is a sectional view in the axial direction of the gas generator for an air bag of the present invention
- FIG. 6 is a diagram for explaining the positional relationship of components in FIG.
- An axial direction means the axial direction of the housing
- a radial direction means the radial direction of the housing.
- an outer shell container is formed by a housing 101 formed by joining a diffuser shell 102 and a closure shell 103 forming an internal storage space together with the diffuser shell 102.
- the diffuser shell 102 and the closure shell 103 are welded at a weld 104.
- the diffuser shell 102 is provided with a required number of gas outlets 107, 108, and 109, which are closed with a sealing tape 110 made of aluminum or the like to prevent moisture.
- the gas outlets 107, 108, 109 may have the same or different diameters.
- a substantially cylindrical inner cylinder 115 is disposed in the housing 101. Above inner cylinder 115 The peripheral edge of the end is fixed to the ceiling surface 102a of the diffuser 102 by welding at the welded portion 106, and the peripheral edge of the lower end is inserted into the opening of the bottom surface 103a of the closure shell 103 and fixed by welding at the welded portion 105. The space is separated.
- a cylindrical combustion chamber 120 is provided in an outer space of the inner cylinder 115, and accommodates a gas generating agent (not shown).
- a gas generating agent those having a combustion temperature of 1000 to 170 CTC can be used.
- the retainer 125 adjusts the capacity of the combustion chamber 120 according to the amount of the gas generating agent.
- the inner space of the inner cylinder 115 is an ignition means chamber 116, in which a transfer agent 117 and an electric igniter 118 filled in an aluminum nip are arranged.
- the igniter 118 is fixed by caulking the opening peripheral edge 119 of the inner cylinder 115.
- As the transfer agent 117 a gas generating agent having a combustion temperature of 1700 to 3000 can be used.
- the igniter 118 is connected to a power source (battery) via a connector and a lead wire.
- a required number of communication holes 125 and 126 are provided for communicating the ignition means chamber 116 and the combustion chamber 120. ing.
- the communication holes 125 and 126 are closed by a seal tape 127 made of aluminum or the like. However, if the seal between the electric igniter 118 and the inner cylinder 115 is secured, the seal tape 127 is not necessary.
- a cylindrical filter 130 for removing combustion residues from the combustion gas and cooling the combustion gas is arranged. ing.
- the same cylindrical filler 130 as that shown in FIG. 1 can be used.
- An inner cylindrical shielding plate 140 is disposed inside the cylindrical filter 130, and a gap (first gap 135) is provided between the cylindrical filter 130 and the inner cylindrical shielding plate 140.
- the first gap 135 is a portion having good air permeability. It should be noted that, instead of the gap 135, the cylindrical filter at a portion (a portion having the same width as the gap 135) in contact with the inner cylindrical shielding plate 140
- the structure may be the same as the case where the luer 130 has a sparse structure and the gap 135 is provided.
- the gap and the width of the sparse structure portion can be the same as those shown in FIG.
- the inner cylindrical shielding plate 140 may be the same as the inner cylindrical shielding plate 66 in FIG. 1, but in the present embodiment, the inner cylindrical shielding plate 140 includes an annular bottom surface 141 and an annular peripheral wall 142 suspended from the annular bottom surface 141. It is preferable to use a ring whose outer diameter is set to be larger than the outer diameter of the annular peripheral wall 142. In FIG. 5, the width of the annular bottom surface 141 (the difference between the diameter of the outer circumference and the diameter of the inner circumference) and the radial distance between the cylindrical filter 130 and the inner cylinder 115 are set to be substantially the same.
- annular bottom surface 141 and the annular peripheral wall 142 as the inner cylindrical shielding plate 140 facilitates the mounting work of the inner cylindrical shielding plate 140 and forms the first gap 135. Will also be easier.
- the inner cylindrical shielding plate 140 is arranged such that the annular bottom surface 141 is in contact with the housing ceiling surface 102a, and the outer peripheral edge of the annular bottom surface 141 is in contact with the inner peripheral surface of the cylindrical filter 130.
- the inner cylindrical shielding plate 140 can be arranged such that the annular bottom surface 141 is in contact with the housing bottom surface 103a according to the positions of the communication holes 125 and 126, the gas outlet 107, and the like.
- the formation position xL of the communication hole 126 formed in the peripheral wall of the inner cylinder 115 in the housing axial direction is L
- the relationship with the position yL of the inner cylindrical shielding plate 140 (tip 143) satisfies both of the following (a) and (b). In addition to these, further satisfies (c) at the same time. Is desirable. The same relationship is satisfied when the annular bottom surface 141 is arranged so as to be in contact with the housing bottom surface 103a.
- X in xL is from 0.05 to 0.6, and y in yL is from 0.3 to 0.8. (Here, X is based on the center of the communication hole 126.)
- the ignition energy colliding with the inner cylindrical shielding plate 140 changes its traveling direction downward (flow reverse to that in FIG. 4), and causes the gas generating agent existing in the traveling direction to ignite and burn.
- the ignition and combustibility of the entire gas generating agent is improved.
- a second gap 150 is provided between the cylindrical filter 130 and the housing peripheral wall (the diffuser shell peripheral wall 102b and the closure shell peripheral wall 103b).
- the same thing as the outer cylindrical shielding plate 67 of FIG. 1 can be further arranged. In that case, similarly to the case of FIG. The filtration and cooling functions of the filter are enhanced.
- the outer cylindrical shielding plate When arranging the outer cylindrical shielding plate, one edge of the opening is in contact with the housing bottom 103a, and the edge of the other opening is the housing ceiling. 102a and a peripheral wall of the housing having gas outlets 107, 108 and 109.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Bags (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60319577T DE60319577T2 (de) | 2002-12-09 | 2003-12-09 | Gasgenerator für airbag |
EP03777395A EP1571049B1 (en) | 2002-12-09 | 2003-12-09 | Gas generator for air bag |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-356704 | 2002-12-09 | ||
JP2002356704 | 2002-12-09 | ||
JP2003-382436 | 2003-11-12 | ||
JP2003382436A JP2004203373A (ja) | 2002-12-09 | 2003-11-12 | エアバッグ用ガス発生器 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004052693A1 true WO2004052693A1 (ja) | 2004-06-24 |
Family
ID=32510618
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/015725 WO2004052693A1 (ja) | 2002-12-09 | 2003-12-09 | エアバッグ用ガス発生器 |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1571049B1 (ja) |
JP (1) | JP2004203373A (ja) |
DE (1) | DE60319577T2 (ja) |
WO (1) | WO2004052693A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1989030B (zh) * | 2004-08-10 | 2010-05-26 | 大赛璐化学工业株式会社 | 气囊气体发生器 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4494023B2 (ja) | 2004-01-15 | 2010-06-30 | ダイセル化学工業株式会社 | エアバッグ用ガス発生器 |
US7648163B2 (en) | 2004-08-10 | 2010-01-19 | Daicel Chemical Industries, Ltd. | Gas generator for air bag |
JP4620415B2 (ja) * | 2004-09-13 | 2011-01-26 | 日本工機株式会社 | 発音装置 |
JP2009078739A (ja) * | 2007-09-27 | 2009-04-16 | Nippon Kayaku Co Ltd | ガス発生器用フィルター及びガス発生器 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5100174A (en) * | 1990-12-18 | 1992-03-31 | Trw, Inc. | Auto ignition package for an air bag inflator |
EP0857627A1 (en) * | 1997-02-10 | 1998-08-12 | Daicel Chemical Industries, Ltd. | Gas generator for an air bag and air bag system |
JP2001097172A (ja) * | 1998-09-28 | 2001-04-10 | Daicel Chem Ind Ltd | エアバッグ用ガス発生器及びエアバッグ装置 |
JP2002046569A (ja) * | 1999-02-16 | 2002-02-12 | Daicel Chem Ind Ltd | 多段式エアバッグ用ガス発生器及びエアバッグ装置 |
JP6067711B2 (ja) * | 2011-09-02 | 2017-01-25 | クゥアルコム・インコーポレイテッドQualcomm Incorporated | 複数のデバイスからの通信を確認応答するためのシステムおよび方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3921472C1 (en) * | 1989-06-30 | 1990-11-15 | Bayern-Chemie Gesellschaft Fuer Flugchemische Antriebe Mbh, 8261 Aschau, De | Device for gas generator - in which gas for inflating cushion for protecting travellers in vehicle crash can take two routes to gas outlet |
DE3921473C1 (en) * | 1989-06-30 | 1990-11-15 | Bayern-Chemie Gesellschaft Fuer Flugchemische Antriebe Mbh, 8261 Aschau, De | Device for gas generator - comprises gas for inflating cushion for protecting vehicle passengers with two routes to gas outlet |
DE4005871A1 (de) * | 1990-02-24 | 1991-09-05 | Bayern Chemie Gmbh Flugchemie | Gasgenerator |
JPH0966795A (ja) * | 1995-08-31 | 1997-03-11 | Nippon Kayaku Co Ltd | エアバッグ用ガス発生器 |
DE19541798A1 (de) * | 1995-11-09 | 1997-05-15 | Temic Bayern Chem Airbag Gmbh | Gasgenerator mit Regelung des Treibgasstromweges und Verfahren zu seinem Betrieb |
EP0864553B1 (en) * | 1995-12-01 | 2013-02-27 | Kabushiki Kaisha Kobeseikosho | Gas generating agent and transfer charge for use in airbag gas generator, and gas generator comprising said gas generating agent and transfer charge |
US6234521B1 (en) * | 1996-04-08 | 2001-05-22 | Daicel Chemical Industries, Ltd. | Airbag inflator and an airbag apparatus |
-
2003
- 2003-11-12 JP JP2003382436A patent/JP2004203373A/ja not_active Withdrawn
- 2003-12-09 EP EP03777395A patent/EP1571049B1/en not_active Expired - Lifetime
- 2003-12-09 WO PCT/JP2003/015725 patent/WO2004052693A1/ja active IP Right Grant
- 2003-12-09 DE DE60319577T patent/DE60319577T2/de not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5100174A (en) * | 1990-12-18 | 1992-03-31 | Trw, Inc. | Auto ignition package for an air bag inflator |
EP0857627A1 (en) * | 1997-02-10 | 1998-08-12 | Daicel Chemical Industries, Ltd. | Gas generator for an air bag and air bag system |
JP2001097172A (ja) * | 1998-09-28 | 2001-04-10 | Daicel Chem Ind Ltd | エアバッグ用ガス発生器及びエアバッグ装置 |
JP2002046569A (ja) * | 1999-02-16 | 2002-02-12 | Daicel Chem Ind Ltd | 多段式エアバッグ用ガス発生器及びエアバッグ装置 |
JP6067711B2 (ja) * | 2011-09-02 | 2017-01-25 | クゥアルコム・インコーポレイテッドQualcomm Incorporated | 複数のデバイスからの通信を確認応答するためのシステムおよび方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1571049A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1989030B (zh) * | 2004-08-10 | 2010-05-26 | 大赛璐化学工业株式会社 | 气囊气体发生器 |
Also Published As
Publication number | Publication date |
---|---|
DE60319577D1 (de) | 2008-04-17 |
DE60319577T2 (de) | 2009-03-19 |
EP1571049B1 (en) | 2008-03-05 |
EP1571049A4 (en) | 2006-03-08 |
EP1571049A1 (en) | 2005-09-07 |
JP2004203373A (ja) | 2004-07-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP3968367B2 (ja) | 二段式火工品技術エアバックインフレータ | |
EP1200289B1 (en) | Dual stage airbag inflator | |
US6695345B2 (en) | Airbag inflator and an airbag apparatus | |
CN100425481C (zh) | 烟火式侧向碰撞充气器 | |
JP4280161B2 (ja) | エアバッグ用ガス発生器 | |
JP4782485B2 (ja) | エアバッグ用ガス発生器 | |
US5876062A (en) | Airbag inflator with direct electrical ignition for small sized gas generant bodies | |
JP4494023B2 (ja) | エアバッグ用ガス発生器 | |
EP1266807B1 (en) | Gas generator | |
US7172214B2 (en) | Gas generator for air bag | |
JP4170586B2 (ja) | 小型インフレータ | |
JP2004359031A (ja) | 多段着火式ガス発生器 | |
US7648163B2 (en) | Gas generator for air bag | |
WO2004052693A1 (ja) | エアバッグ用ガス発生器 | |
WO2004052523A1 (ja) | エアバッグ用ガス発生器 | |
JP4633918B2 (ja) | ガス発生器 | |
JP4113424B2 (ja) | エアバッグ用ガス発生器 | |
JPH1029493A (ja) | エアバッグ用ガス発生器及びエアバッグ装置 | |
JP2004237971A (ja) | エアバッグ用ガス発生器 | |
JP2001039261A (ja) | エアバッグ用ガス発生器及びエアバッグ装置 | |
US20020073873A1 (en) | Gas generator for low-slag gas cartridges for motor vehicle safety | |
JPH02155858A (ja) | エアバック展開用ガス発生装置の燃焼室 | |
CN1329230C (zh) | 用于气囊的气体发生器 | |
JP2003312435A (ja) | エアバッグ用ガス発生器 | |
JP2023175583A (ja) | エアバッグ装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CN |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 20038A48313 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2003777395 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 2003777395 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 2003777395 Country of ref document: EP |